Siemens SINAMICS DCM Operating Instructions Manual page 502

Descriptions of functions
10.32 Free function blocks
Notes
● The actual CPU time load of the CUD can be read out on r9976. Please refer to the "CPU
● To make own calculations, the above-illustrated CPU time loads can be taken as "linear".
● Each individual free function block can be assigned to a runtime group via parameter
500
time load with the SINAMICS DCM" chapter for more information about the CPU load
with the SINAMICS DCM.
This means that:
– half as many blocks in the same time slice generate half as much CPU time load, etc.
– the same number of blocks in time slices half as fast generate half as much CPU time
load, etc.
(e.g. p20032). 10 runtime groups are available. Every runtime group can be assigned a
time slice using p20000.
The time slices that can be selected with p20000 = 1 to 1096 are calculated
asynchronously to the closed-loop control functions.
The time slice that can be selected with p20000 = 9003 is that time slice, in which the
setpoint channel (function diagrams 3105 to 3155) is calculated. One of the free function
blocks assigned to this time slice is immediately calculated before the functions of the
setpoint channel.
Operating Instructions, 1.2012, C98130-A7066-A1-05-7619
SINAMICS DCM DC Converter